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Search Results: 1 - 10 of 141219 matches for " 杨和连 "
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湖北省选派科技副县(市)长的两年回顾
,元魁
科技进步与对策 , 1990,
Abstract:
不同基质对“珍珠”南瓜叶绿素及NR 和 POD 活 性 的 影 响
武英霞,沈 军,,李新峥,刘振威
北方园艺 , 2010,
Abstract:
COUPLING ANALYSIS ON HYDRAULIC FRACTURING PROCESS OF ROCK
岩石水压致裂过程的耦合分析

Li Lianchong,Yang Tianhong,Tang Chun''''an,YangChunhe,
,天鸿,唐春安,

岩石力学与工程学报 , 2003,
Abstract: Hydraulic fracturing is a typical illustration of coupling between seepage and stress in rock failure process. Based on Biot seepage mechanics equations and elastic damage theory, the coupling model between seepage and stress in rock failure process is proposed. By using Coupling System of Flow and Solid in Rock Failure Process Analysis, F-RFPA2D, the initialization and propagation of crack in hydraulic fracturing process is simulated to analyze the law of permeability evolvement, seepage-stress coupling mechanism and unstable behavior of rock.
办好高新技术产业开发区努力发展高新技术产业――全国高新技术产业开发区工作会议综述
,张平
科技进步与对策 , 1991,
Abstract:
瑞士农业发展给我们的启示

科技进步与对策 , 1993,
Abstract:
依靠科技进步实施产品战略

科技进步与对策 , 1991,
Abstract:
1000kV特高压输电线路潜供电弧试验研究
彦淼,宋杲,曹荣江,袁亦超,林集明,,李炜,,韩彬
中国电机工程学报 , 2011,
Abstract: 潜供电弧的自灭时间决定单相重合闸的重合时间和成功率,潜供电弧自灭特性的研究是保证单相重合成功的关键技术。特高压输电线路潜供电弧试验室模拟试验是行之有效的研究方法,根据特高压回路设计可能的潜供电流和恢复电压值,采用试验室单相等价回路进行了相应风速、电压梯度、潜供电流值的无补偿、正常补偿和过补偿情况下的102组(共计2013次)潜供电弧模拟试验,深入研究了特高压输电线路潜供电弧自灭特性,其结果为确定断路器单相重合闸时间整定值的设计规范提供了科学依据。
松突圆蚧对马尾松危害程度与生态因子关系的研究
顾茂彬,王宝生,李意德,曾奖,邱坚锐,陈佩珍,陈芝卿,,翁锦泅
林业科学研究 , 1990,
Abstract: 松突圆蚧危害程度的划分是以2年生枝条上松针的保存率、枝梢形状和生势作为依据,用60株平均木树干解析连年生长量验证,准确率达87.73%。对惠东、深圳等6个县(市)9个调查区60块标准地的综合调查结果:危害轻度和中等的林下植物多为草本植物群丛组、桃金娘群丛,其土层松厚肥沃;危害较严重和严重的林下植物多为芒萁群丛、马唐+芒萁群丛及山的上部,其土壤酸度大、瘠薄。林分因子中,郁闭度与危害程度呈多项式二次幂关系,郁闭度0.5~0.65的危害最轻;水汽压与郁闭度也呈多项式二次幂关系,郁闭度0.5~0.6的水汽压最低。
中国进口农产品质量测算——基于2000-2013年的数据分析
Quality Measurement of China's Import Agricultural Products: 2000-2013

,,
- , 2018,
Abstract: 基于2000~2013年中国海关贸易数据库数据,采用产品层面回归反推方法对中国进口农产品质量进行测算,并从贸易方式、所有制、HS编码、进口(来源)国等方面分析中国进口农产品贸易的质量结构特点。研究发现:中国进口农产品质量在2000-2013年总体呈上升趋势,2010-2012年呈现出明显的倒“U”型变化;中国进口农产品质量呈上升趋势这一结论对于不同贸易方式、不同所有制、不同编码农产品、不同进口(来源)国都基本成立。
The article is based on China Customs Database from 2000 to 2013. The paper adopts the product-level regression method to estimate the quality of China's import agricultural products, and analyzes the quality structure characteristics of China's import agricultural products from the aspects of trade, ownership, HS codes and source countries. The study finds that the quality of China's import agricultural products shows a rising trend in general from 2000 to 2013, which presents a significant reverse "U" style from 2010 to 2012. We concludes that China's import agricultural products' upward trend in their quality is basically true in the following aspects: trading styles, types of ownership, HS codes of agricultural products, and source countries.
基于ARM的二维条码识别与语音播报研究
Two-Dimensional Bar Code Recognition and Voice Broadcast Based on ARM
 [PDF]

世耀, 刘幺, 杨志
Computer Science and Application (CSA) , 2011, DOI: 10.12677/csa.2011.12012
Abstract: 条码技术是随通信技术,计算机技术的发展应运而生的一种新型的自动识别技术。二维条码是在一维条码基础上形成的高密度、高信息量的条码,可以将大量信息在小区域内编码,它本身就是一个完整的数据文件,是实现证件、卡片等信息存储、携带并可以通过机器自动识读的理想方法。针对条码采集环境不确定和识别系统可移植性特点,设计一种基于ARM9的便携式二维条码识别及语音播报系统。该系统以三星公司S3C2440芯片为核心处理单元,嵌入式操作系统μC/OS-II为开发平台,通过C语言编程,实现二维条码图像识别、码字解码及语音播报。移植测试结果表明,该系统能够实现对PDF417码、Data Matrix码、汉信码等二维条码的全方位识读以及语音播报,识别率高,可靠性好。
With the development of communications technology and computer technology barcode technol-ogy came into being a new type of automatic dentification technology. Two-dimensional bar code is based on one-dimensional bar code, and high-density high information content on the barcode. Large amount of in-formation can be encoded in the small area. Two-dimensional bar code is itself a complete data file which is to achieve certificates, cards and other information storage, portable and can be automatically readable by machines. Acquisition environment for bar code identification system and portability features of uncertainty, design a two-dimensional bar code identification and voice broadcast system based on ARM9. The system takes Samsung S3C2440 chip as the core processing unit, uses embedded operating system μC/OS-II as de-velopment platform. By C language programming achieving two-dimensional bar code image recognition, code word decoding and voice broadcast. The results show that transplantation, the system can realize the two-dimensional bar code such as PDF417, Data Matrix code, the letter codes of Chinese and so on, can read them by voice broadcast. The system has high recognition rate and reliability.
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